Wrapping a class method by including a module

module_wrapper.rb

module Wrapper

  def self.included(base)
    base.extend ClassMethods
  end

  module ClassMethods

    def wrap!
      class << self
        alias_method :original_perform, :perform
        def perform(*args)
          original_perform(*args)
          # add in anything you want to do now
        end
      end
    end

    def singleton_method_added(name)
      wrap! if name == :perform && !self.respond_to?(:original_perform)
    end
  end

end